Estimated Sources of Short-lived Sulpher Gases (Tg S per year)

Anthropogenic emissions (mainly SO2)	70-80
Biomass burning (SO2)	0.8-2.5
Oceans (DMS)	10-50
Soils and plants (DMS and H2S)	0.2-4
Volcanic emissions (mainly SO2)	7-10

Adapted from Houghton, J.T., Climate Change 1992. Cambridge University Press.